Star Trek: Voyager - Dark Frontier Official

"Dark Frontier" provides the most comprehensive look at how Annika Hansen became Seven of Nine.

During the mission, the Borg Queen (played by Susanna Thompson) contacts Seven of Nine, offering her a choice: rejoin the Collective or watch Voyager be assimilated. Star Trek: Voyager - Dark Frontier

The episode balances a high-stakes "current-day" mission with critical flashbacks to Seven of Nine's childhood as Annika Hansen. "Dark Frontier" provides the most comprehensive look at